PRESSURE CONTROLS
HRVD08-20 Relief, Poppet-Type, High Pressure
DESCRIPTION
A screw-in, cartridge-style, direct-acting, poppet-type, hydraulic relief valve with
dampening intended for use as a pressure limiting device for common hydraulic circuit
protection. This valve can be used in bi-directional/cross-over relief applications.
OPERATION
The HRVD08-20 blocks flow from 1 to 2 until sufficient pressure is present at 1 to
force the poppet from its seat. The cartridge offers fast response to load changes in
typical hydraulic circuits requiring low hysteresis, low pressure rise and low internal
leakage. A built-in dashpot helps stabilize the valve and minimize poppet noise.
FEATURES
• 1000-hour-salt-spray-rated protective coating per ASTM B117 standard.
• Height of the adjuster does not change when the pressure setting is adjusted.
• All adjustment options have positive stops that prevent springs from going solid.
• Dashpot quiets poppet movement.
• Variety of spring ranges to 420 bar (6100 psi).
• Variety of adjustment options.
• Rapid response to pressure surges.
• Low leakage.
• Stable performance.
• Flat pressure rise.
RATINGS
Pressure Rating: 420.6 bar (6100 psi) at Port 1; Cross-over/bi-directional relief
pressure: 241.3 bar (3500 psi) at Port 2.
Proof Pressure: 785.4 bar (11000 psi)
Burst Pressure: 1516 bar (22000 psi)
Flow Rating: Port 1 to 2: 52.9 lpm (14 gpm) at max pressure
The Performance Chart illustrates flow handling capacity at maximum setting for
each spring range option. Pressure rise will vary with spring (range) and
with setting within range due to flow forces. Consult factory for specific flow
characteristic values.
Crack (Set) Pressure Defined: bar (psi) evident at 0.95 lpm (0.25 gpm)
Reseat Pressure: Nominal 85% of crack pressure; leakage to 1 ml/min
(20 drops/min)
Maximum Internal Leakage: .25 ml/minute (5 drops/minute) max. to 75% of
nominal setting
Operating Temperature: -40 to 100°C (-40 to 212°F) with standard Buna N seals;
-26 to 204°C (-15 to 400°F) with fluorocarbon seals
-54 to 107°C (-65 to 225°F) with polyurethane or urethane seals
Filtration: See page 9.010.1
Fluids: Mineral-based or synthetics with lubricating properties at viscosities of
7.4 to 420 cSt (50 to 2000 sus); See Temperature and Oil Viscosity, page 9.060.1
Installation: Urethane seals are required for bi-directional/cross-over relief
applications. For general installation instructions; see page 9.020.1
Cavity: VC08-2 Variation A or HVC08-2 Variation A; See page 9.108.1
Cavity Tool: CT08-2XX. If used with HVC08-2, use cavity tool HCT08-2XX;
See page 8.600.1
Seal Kit: SK08-2X-B (X = N, V, HV, P); SK08-2U-O (Urethane seals required for
bi-directional and cross-over relief applications); See page 8.650.1
ISO SYMBOL
PERFORMANCE
(Cartridge Only)
6.011.1
HYDRAFORCE
.com
®
207/3000
172/2500
138/2000
103/1500
69/1000
8
2
15
4
23
6
30
8
38
10
45
12
FLOW RATE lpm/gpm
DIFFERENTIAL PRESSURE bar/psi
Differential Relief Pressure vs. Flow
32 cSt/150 sus oil at 40°C (104°F)
35/500
241/3500
276/4000
310/4500
345/5000
379/5500
Spring Option 20
Spring Option 14
Spring Option 07
Spring Option 30
Spring Option 50
Spring Option 40
53
14
414/6000
449/6500
Spring Option 61
Saturation Flow
Blue rectangles are links to other catalog pages.
Seals
Pressure on
Port 1 Only:
N Buna N (Std.)
V Fluorocarbon
HV 90 Durometer
Fluorocarbon
P Polyurethane
U Urethane
Bi-directional
Pressure:
U* Urethane
DIMENSIONS
MATERIALS
Cartridge: Weight: Depending on
adjustment option, cartridge
weight varies from 0.19 to 0.22 kg.
(0.41 to 0.48 lbs.) Steel with
hardened work surfaces.
Zinc-plated exposed surfaces.
Anodized aluminum knobs.
Standard Ported Body: Weight:
0.63 kg. (1.38 lbs.) ductile iron.
For pressures over 206 bar
(3,000 psi), use H-series ductile
iron body cavity; dimensions and
weight will differ.
See page 8.008.1.
TO ORDER
Setting in bar
†
(Blank) for Adjustable, or
Specify, for example:
M150 150 bar
Setting in psi
†
(Blank) for Adjustable, or
Specify, for example:
03.5 350 psi
Porting
Cartridge Only 0
SAE 8 8TD
3/8 in. BSP* 3BD
*BSP Body; U.K. Mfr. Only
†
Adjustable valves will be preset
to approx. 50% of spring max.
HRVD08-20__ - __ __ __ - __ - __ __ / __ __ __ __
Adjustment Option
1/4 in. Hex Allen Head A
1-1/2 in. Dia. Alum. Knob B
Option A w/ Cover Cap C
Factory Preset Non-Adj. F
Factory Preset
Hidden Adjustment H
Option C
w/Lockwire Holes L
HRVD08-20
6.011.2
Spring Range
07 13.8 to 48.3 bar
(200 to 700 psi)
14 48.3 to 96.5 bar
(700 to 1400 psi)
20 96.5 to 137.9 bar
(1400 to 2000 psi)
30 137.9 to 206.8 bar
(2000 to 3000 psi)
40 206.8 to 275.8 bar
(3000 to 4000 psi)
50 275.8 to 344.7 bar
(4000 to 5000 psi)
61 344.7 to 420.5 bar
(5000 to 6100 psi)
®
HYDRAFORCE
HYDRAFORCE
.com
®
ACROSS
FLATS
ACROSS
FLATS
2.75
69.9
TORQUE:
33 – 37 ft-lbs
44.7 – 50.2 Nm
ORIFICE DISCS SHOULD NOT
BE USED WITH THIS VALVE.
2.15
54.6
Option A
Option B
Knob Dia.
1. 1 3
28.6
0.20
5.0
Options C or L
Options F or H
0.75
19.1
1.48
37.6
0.61
15.5
2.75
69.9
1.63
41.0
0.20
5.0
2.25
57.2
1.50
38.1
TYP
TYP
DUCTILE IRON
BODY SHOWN
1.25
31.8
0.63
15.9
0.90
22.9
2.25
57.2
1.00
25.4
Ø
Bi-Directional and Cross-over Relief
*
Urethane seals should be
used in bi-directional and
cross-over relief
applications.
For crossover relief
applications 241.3 bar
(3500 psi) maximum
Due to manufacturing tolerances, it may be possible to adjust the valve
either lower or higher than the nominal ratings shown below. If the valve is
adjusted beyond the recommended maximum pressure range for any style
adjuster option, the valve may not open to relieve system pressure.
Blue rectangles are links to other catalog pages.
